its not impossible because its happened in black communities and also to countless other words like dumb or moron which i believe used to be horribly derogatory terms for people with mental disabilities but are now just ordinary insults teaching people to be extra offended by the word nigger when said by white people just preserves its power to offend if we taught that actually it doesnt have some mystical power to hurt you then racists wouldnt have such a powerful weapon to offend black people